i submit my program,but the status is always "running"
now i have no idea about it,maybe something is wrong with the judge?
here is my program:

#include <stdio.h>
#include <string.h>
#include <math.h>
#include <ctype.h>

int x=0,y=0,z=0;

void eliminate_x(){
    y+=x,z-=x,x=0;
}

void eliminate_y(){
    x+=y,z+=y,y=0;
}

void eliminate_z(){
    x-=z,y+=z,z=0;
}

int main()
{
    int i,n,step,type=0,min,m;
    char c;
    //freopen("test.in","r",stdin);
    scanf("%d",&n);
    for(i=0;i<n;i++){
        c=0;
        while(!isalpha(c)) c=getchar();
        scanf("%d",&step);
        if (c=='X') x+=step;
        else if (c=='Y') y+=step;
        else if (c=='Z') x-=step,y+=step;
    }
    min=abs(x)+abs(y);
    eliminate_x();
    if (abs(y)+abs(z)<min) min=abs(y)+abs(z),type=1;
    eliminate_y();
    if (abs(x)+abs(z)<min) min=abs(x)+abs(z),type=2;
    m=0;
    if (type==0){
        eliminate_z();
        if (!x) m++;
        if (!y) m++;
        printf("%d\n",m);
        if (x) printf("X %d\n",-x);
        if (y) printf("Y %d\n",-y);
    }else if (type==1){
        eliminate_x();
        if (!y) m++;
        if (!z) m++;
        printf("%d\n",m);
        if (y) printf("Y %d\n",-y);
        if (z) printf("Z %d\n",-z);
    }else{
        if (!x) m++;
        if (!z) m++;
        printf("%d\n",m);
        if (x) printf("X %d\n",-x);
        if (z) printf("Z %d\n",-z);
    }
    return 0;
}

if wait a little more (at last 1day) you will find your result. don`t
submit it again...
Yours
Aidin

Yeah... And my program keep running. I submit it before 12
hours !!!! :))))
How many tests there is for this problem ? :))